Automatic oven-heat regulator.



W. E. TURNER.

AUTOMATIC OVEN HEAT REGULATOR.

' APPLICATION FILED JULY 16. I917.

Patented May 21,1918:

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To all whom may concern:

Be it, knownthat ll, WALTEREBER Tunmm, a citizen ofthe United States, residing at Pique, inthe count of Miami and State of Ohio, have in'vente certain new and useful Improvements in Automatic Oven-Heat Regulators, of which the following is a. Y specification.

, This invention-relates to new and. useful im rovements 1n. thermostatlc devlces or sel -'acting means adected by changes; in temperature and automatically re lating Y the supply of fuel such as gas, eit erlnatural or artificial, to an owner any other heatin apparatus so that the heat'may be contro ed and maintained at any desired temperature. The invention is i'nore particularly designed for use in connection with gas ranges or ovens in householder domestic use. The object of the invention is'to prosimple construction and of maximum emciency and wherein a rane of temperature control is had. With these ends in view, certain elemehts'are employed among which is means for determining'the range of temperature control incom'bi'nation with other devices which will be more fully described in the following specification.

Before describing the invention in detail reference is made to the accompanying drawings of which Figure 1 is an elevation of a well-known form of gas range having my improved-thermostat or temperaturecontrolllng device applied thereto. Fig. 2 is a somewhat enlarged perspective view of the thermostat and cooperating parts includin the drawings.

I temperature-controllin mestic use. In thedrawings l[ have illustrated it in connection with a asrange in the oven of which it is located in a osition to control the burner thereof, or rat er, th

AUTOMATIC OVEN-HEAT REGULATOR.

Specification of Letters Patent. Application filed Jul it,

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1917. serial 1W0. N0392- heat generated by the oven burner. The.

temperature indicator is located at a convenient place. The burner maybe of any of the well-known forms of gas burners. In the drawings'lt have illustrated a rectangular form of burner 1 with 'a mixer 2 into which the supply pipe or jet 3 projects, the said supply pipe or jet having an orifice which is controlled by a suitable needle valve 4:.

a The needle valve extends through an open-= ing in a portion of the burner to which the m xer is attached and said needle valve is connected. to the lower end of a thermostatic bar 5, said bar'being formed by fusing two metals together which have a difierent coefficiency of expansion as is well known in the'construction of thermostats.- The end of; I i

- the thermostatic bar opposite that end which is connected to the needle valve extensiom'is connected to one end of a longitudinally movable pin 6. The pin 6 passes through a statlonary guide or block 7 and is freely mov-. able through the opening in said block pro- Vided therefor. The free end of the pin 6 engages the tapered side of a movable cam wedge 8.which in turn is connected with a connecting rod 9, such connection being at a I the upper end of the'cam wedge 8. The movable cam wedge 8 is kept in contact with a guide or block20 in wh ch it is movable up and down. The guide or block .20 is made stationaryby being screwed or otherwise fixed at a suitable point. A suitable spring 10 is employed to maintain the pin 6 in contact with the movable cam wedge 8. In the drawings I have shown "such spring having one end attached to the pin 6 and the'other end made -fast' at a convenient 'point, the said spring having a force sufl'icient to maintain' such contact'of the pin and thereby the cam wedge is kept in engagement with its guide. Of course, it willbe understood that means maybe employed for moving the pin in setting the position of the thermostat and valve, for example, a cam other than the wedge-like form as shown might be efiec tively employed, and any suitable form of spring may be used for exerting the necessary force u on the pinin the direction of the cam we ge 8 my urpose being to employ any device by w ich the thermostatic element can he moved back and forth to pov sition the valve relative .to the'fuel inlet. The connecting rod 9 extendin from the I cam wedge 8 is in turn conneete with a llfi'" ver 11 having a fulcrum 12 at or near its center upon which it has a reverse motion. A suitable connection is made between the lever 11 and the indicating dial 13 whereby the lever may be set to the desiredtemperature as shown on the divisionalv scale of the indicator and the valve correspondingly moved.

This connection with the lever may be either by means of a cam, or gearing, orany other suitable connection which will enable the lever to be moved and therewith the thermostat and valve to the desired positions as indicated by the dial. In the drawings I have shown the end of the lever 11 'as'terminated in an internal rack 14: which meshes with a pinion 15 secured to the dial spindle 16 and to which spindle is also secured the dial pointer 17 which moves over the faoe'bf the dial. It will be understood that the indicator dial is properly calibrated or divided to show the degrees of Fahren- I heit. By turning the spindle 16 the lever 11 a temperature to w is set at the desired temperature and this temperature 'will I be automatically maintained. It will be understood that imthe movement of the lever ll-the cam wedge 8 moved and the range of ich the lever has been set is thereby controlled. It will be further understood that as the cam wedge 8 is moved upwardly by the adjustment of the lever 11,

is correspondingly the'pin 6 and the thermostat 5 are thereby caused to move farther'away from the orifice in the burner pipe 3 and thus the needle valve 4 is moved out of said orifice, and therefore, before the'gas can be diminished in its flow, it becomes necessary for the thermostat to move'much farther thus requiring a greater temperature to enable it to do so.

-- marks in indicating t e temperature.

.ment connected to said support for said thermostatic element, a

movable wedge-like member engaging said 80 It will be apparent that modifications Ina be made to a greater or less extent in detai s of construction Without departing from the essential features of the device, among which is a cam member through the instru- 6'5 mentality of which the range of temperature within the oven may be varied and automatically maintained at a given 'point. Such modifications are contemplated within the scope of the subjoined claims.

Having described my invention, I claim: 1. In a device of the character specified, a fuel inlet member, a needle valve cooperating therewith adapted to control the admission of fuel to a burner, a thermostatic element connected to said valve, a supporting member for said thermostatic element, a cam adapted to vary the position of the supporting member of the thermostatic element,

I t I a-lever adapted to move said cam, and a temperature indicator associated with said lever and by means of which the extent 'of movement of the lever is determined.

2. In a device of the character specified,

a fuel inlet member, a needle valve cooperating therewith adapted to control the admission of fuel to-a burner a thermostatic elevalve, a shiftable shiftable support and adapted to change the normal positlon of the needle valve with reference to the fuelinlet, a spring exerting a force on saidshiftable 'sup ort counter to that of the wedge-like mem er, and means for actuating said Wedge-like member in opposite directions.

- 3. Anautomatic fuel regulating device comprlsingin combination with a valve controlling the admission of fuel to a burner, a thermostatic bar having one end directly connected to said valve, a shiftable supporting member for said thermostatic bar and to L which the other end thereof is directly connected, and means including-as an element a lever for moving said supporting member in adjusting the position of the thermostatic bar relative to the valve.

In testimony whereof I affix my signature.

WATIIFR ERER TURNER. 

